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![](./images/clear.gif) 1.- A PRELIMINARY STUDY OF SOME SANDBIAN (UPPER ORDOVICIAN) GRAPTOLITES FROM VENEZUELA
INSTITUTO GEOLOGICO DE ESPAÑA; MADRID; ESP, 2011
ORDOVICIAN OF THE WORLS
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![](./images/clear.gif) 2.- THE STRATIGRAPHIC DISTRIBUTION OF GRAPTOLITES IN THE CLASSIC UPPER MIDDLE ORDOVICIAN UTICA SHALE OF NEW YORK STATE:AN EVOLUTIONARY SUCCESSION OR A RESPONSE TO RELATIVE SEA-LEVEL CHANGE?
1998
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